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Poster Presentations
Day 4, June 25（Wed.）
Room P (Maesato East, Foyer, Ocean Wing)
- 4P-AM-06
Development of a Dual Photoionization/Electron Impact Ionization Quadrupole Mass Spectrometer
(NSRL,USTC)
oJun Huang, Jiuzhong Yang, Chengyuan Liu, Minggao Xu, Yang Pan
For catalytic reaction systems with complex gas components, conventional electron impact ionization (EI) often generates excessive ionic fragments, complicating detection and analysis. In contrast, photoionization (PI) offers soft ionization capabilities, which produces fewer fragments and is conducive to the qualitative analysis of the products. In our study, a mass spectrometer device based on a quadrupole mass analyzer with an integrated dual ionization source with PI and EI was designed and developed. To enhance PI efficiency, the device was equipped with a three-stage differential pumping system. The sample gas passes through a capillary into the ionization chamber, where either a vacuum ultraviolet discharge lamp or synchrotron radiation light serves as the PI source. Additionally, the mass spectrometer was coupled with an EI source to achieve effective detection of some small inorganic molecules with high ionization energy. In parallel, the flow field and ion transport trajectories in the mass spectrometry were also simulated by the multiphysics ion trajectory numerical simulations method under trans-fluid conditions. By this method, the device structure was optimized for simulation based on the passage rate of ion transport, which can effectively improve the instrumentation performance of the device.